I'm having trouble with a little .22. The cylinder lock will not drop to allow the cylinder to rotate when you cock the hammer. I took the trigger group out and made sure there were no broken parts or springs. Noticed that when putting it back together, if the front pinis installed, then the rear of the trigger guard is left about a pin width the cylinder lock will drop like it is supposed to...once the rear of the trigger guard is in position, it does not work. realizing this, I have taken it apart several times trying to figure out what might be binding or stopping the lock from working. The rest of the revolver works correctly. I'd hate to junk it over a simple fix/adjustment. Thanks, Mark